Optical: systems and elements – Lens – With variable magnification
Patent
1991-02-14
1992-06-30
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
G02B 1514
Patent
active
051268841
ABSTRACT:
In a compact wide-angle zoom lens which has, in succession from the object side, a first lens unit of positive refractive power and a second lens unit of negative refractive power and in which a magnification change is effected by the relative unit spacing between the two lens units being varied, the first lens unit has at least two negative lens components and at least one positive lens component, and one of the at least two negative lens components is disposed most adjacent to the object side of the first lens unit, and has a negative meniscus shape having its convex surface facing the object side.
REFERENCES:
patent: 4756608 (1988-07-01), Itoh
patent: 4883346 (1989-11-01), Aoki et al.
patent: 4911539 (1990-03-01), Tsunashima et al.
Nikon Corporation
Sugarman Scott J.
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